Need a portable boombox for your smartphone or music player? Industrial design student and Instructables user MTriest has a great, minimalist design that's easy to carry around. It was designed for the iPhone, but you should be able to adapt it to accommodate any similarly-shaped device with a headphone jack. If you want to give it a try, here's what you'll need:

Aside from the speaker (which you can buy here), all the materials are pretty common and easy to come by. Although putting this project together requires a bit of time and some tools (mainly to cut the fibreboard and acryllic), the result is pretty cool. If you don't want to cut the materials yourself, you can always seek out someone on Etsy who regularly cuts these materials and ask for a custom job. Either way, to get the instructions for this project, hit up the full post on Instructables.